"While the debate is raging whether the intensity of these quakes is being under-reported, the more important issue of depth of these quakes is being ignored. They have been closer and closer to the surface. Starting at about 15 kilometers deep a few weeks ago to an average of 5 kilometers deep today."

It is either rising steam/water under high pressure which is most likely considering it is in a geyser basin or it is rising magma. I don't see how it could be techtonic plate related since it has been sitting in the same spot for over a month.

"While the debate is raging whether the intensity of these quakes is being under-reported, the more important issue of depth of these quakes is being ignored. They have been closer and closer to the surface. Starting at about 15 kilometers deep a few weeks ago to an average of 5 kilometers deep today."

Indeed. I was reading this yesterday (2 days ago):

Yellowstone Eruption Days Away?

The current earthquake swarm at Yellowstone can now be called the longest and most eventful in modern history. I include the following snapshot from today's reports:

While the debate is raging whether the intensity of these quakes is being under-reported, the more important issue of depth of these quakes is being ignored. They have been closer and closer to the surface. Starting at about 15 kilometers deep a few weeks ago to an average of 5 kilometers deep today. From 10 kilometers deep on 1/27 to 5 kilometers deep today: